1. 1st divide to half take the heavier out 0 b V, ]8 Q" ?7 L" l% y+ V公仔箱論壇2. 2nd take 4 balls out of 5 divide 2 groups to get the heavier out. (if is equal thn the remain is the one u looking for) ' y- s) N" J1 @- u) R( |$ f3. Same method if is not equal on 2nd try.